[Boatanchors] LightSquared

[D C _Mac_ Macdonald]

The signals coming in to a GPS receiver are in the range 
of a few microvolts (millionths of a Volt). 
 
Signals from the LightSquared tranmitters show up at the 
GPS receiver HUNDREDS, maybe THOUSANDS, of times stronger! 
 
Even if they are not at the same frequency, the GPS 
receiver simply collapses from overload and quits 
providing location information. 
 
And yes, GPS reception in a fairly small area is easy to do. 
Think of the problems a half-dozen jammers around any major 
metropolitan airport or military air field could cause! 
 
And the FAA is in the process of turning most all flight 
control over to GPS! Un-friggin'-believable. And the "suits" 
will NOT listen to folks with practical experience. Disaster 
just waiting to happen! 
 
SHEESH! 
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 
 
 

 

> Date: Tue, 9 Oct 2012 06:00:42 -0700
> From: jfor at quikus.com
> To: rbethman at comcast.net
> CC: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] LightSquared

> > The Global Navigation Satellite System, GNSS, *IS* GPS based precision
> > navigation.
> >
> > It provides precise three dimensional location. LORAN never did that.
> > LORAN is *dead*.
> 
> Most people DON'T CARE about altitude. Pilots are a tiny minority of GPS
> users. And, for geometry reasons, GPS is far less acurate in altitude than
> Lat/Long.
> 
> The decision to shut off LORAN-C is generally believed to be idiotic, and
> politically motivated. GPS is very vulnerable to jamming. GPS jammers are
> easily available for $25 that will kill GPS for >1 mile radius.
> 
> > LightSquared is NOT nor EVER was GPS.
> 
> Nobody ever said it was. Quit with the straw-man arguments.
> 
> > It interferes with GPS. It is a
> > broadband wireless carrier. Read as cell phones and the like.
> >
> > The DOT, (read FAA), and DoD have pitched a fit over the interference of
> > LightSquared with GPS and WAAS. These combined systems, (WAAS is Wide
> > Area Augmentation System. It provides an airport a very fine level of
> > additional GPS data allowing for Zero/Zero landing ability.)
> >
> > This gives pilots the ability to fly down below MDA and put the nose
> > wheel within 6" of the runway center-line.
> >
> > Some folks don't get it! LightSquared's view is that GPS "looks into
> > their Bandwidth", not that it interferes with it.
> >
> > They are fighting the FCCs decision!
> >
> > Bob - N0DGN
> 
> No practical, realizable filter has the kind of reaponse needed to
> separate the two, especially where the LightSquared is 60 to 120 dB
> stronger. Furthermore, a GPS receiver cannot tolerate much insertion loss.
> 
> -John
> 
> =================